The electrical breakdown process in polymethyl methacrylate for a point-to-plane gap configuration has been studied using an image convertor camera and a nanosecond rectangular HV pulse generator. The propagation velocity of the breakdown channel for positive polarity is estimated to be /spl sim/80 km/s. The velocity is of the same order as that of secondary fast streamers in several hydrocarbon liquids.>
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Yamada et al. (1994) studied this question.
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